1 .Simple interest at 10% on ` 5,000 is ` 2,500. The time for which the sum is invested is –

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2 .

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3 .

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4 .Two friends walking at 5 kms/hr and 7 kms/hr start at the same time from two different towns 48 km apart towards each other. After how many hours will they meet each other ?

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5 .A sum amounts to ` 1352 in 2 years at 4% compound interest. The principal is –

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6 .A, B and C are three points on a circle. The tangent at C meets BA produced at T. Given ∠ATC = 36° and ∠ACT = 48°. The angle subtended by AB at the centre of the circle will be –

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7 . If α + β = 90° and α: β = 2 : 1, then find the value of sin α: sin β.

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8 .

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9 .A sai lor goes 12 km downstream i n 48 minutes and returns in 1 hour 20 minutes. The speed of the sailor in still water is –

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10 .($1\over \sqrt9 -\sqrt8$$1\over \sqrt8 -\sqrt7$ +$1\over \sqrt7 -\sqrt6$$1\over \sqrt6 -\sqrt5$+$1\over \sqrt5 -\sqrt4$) is -

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